Reference Components List of a Buck Configuration Circuit

(refer to Typical Application diagram); Input voltage: 100 VAC, LED output voltage: 15 V,

LED peak output current : 0.3 A

Name

Type

Value

Description

LED

LED

―

User-defined

Inductor

1 mH / 1 A

Choke coil for smoothing current

Fast recovery

rectifier diode

RD2A

Free-wheeling diode for recirculation

Capacitor

Up to 4.7 μF / 450 V

Main supply source filtering capacitor; 1 nF or higher can be used

Capacitor

0.1 μF / 25 V

Internal regulator stabilizing capacitor

Capacitor

1000 pF (to 0.1 μF) / 25 V

REF pin voltage stabilizing capacitor

Capacitor

0.1 μF / 250 V

Smoothing capacitor for reducing LED ripple current (Optional)

Capacitor

100 pF / 25 V

PWM off-time setting capacitor (internal PWM control)

Resistor

Resistor for setting peak output current on OUT pin

Resistor

Resistor for setting peak output current on OUT pin

Resistor

1.0 Ω / 1 W

Resistor for output current detection

Note: Because no specific application or noise factor is considered in the typical application circuit diagrammed, it is required

that the user takes into consideration such issues during designing. Moreover, the above values are only reference examples. It

is required to change components according to the LED load and other conditions which are actually used.

LC5222D/25D and

LC5222S/25S

7

SANKEN ELECTRIC CO., LTD.

LC5222D/25D_22S/25S-DS

Off-Line DC/DC LED Driver ICs

August 8, 2012